Chapter 13 - Section 13.2 - Substitution - Exercises - Page 971: 8

$ 2e^{x/2}+C$

Shortcut: $\displaystyle \int e^{ax+b}dx=\frac{1}{a}e^{a\mathrm{x}+b}+C$ ------------------- $a=\displaystyle \frac{1}{2}, b=0, $ $\displaystyle \int e^{x/2}dx==\frac{1}{\frac{1}{2}}e^{\mathrm{x}/2+0}+C$ $=2e^{x/2}+C$